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In Bun, fetch supports sending requests through an HTTP or HTTPS proxy. This is useful on corporate networks or when you need to ensure a request is sent through a specific IP address.
https://mintcdn.com/bun-1dd33a4e/Hq64iapoQXHbYMEN/icons/typescript.svg?fit=max&auto=format&n=Hq64iapoQXHbYMEN&q=85&s=c6cceedec8f82d2cc803d7c6ec82b240proxy.ts
await fetch("https://example.com", {
  // The URL of the proxy server
  proxy: "https://username:[email protected]:8080",
});
The proxy option can be a URL string or an object with url and optional headers. The URL can include the username and password if the proxy requires authentication. It can be http:// or https://.

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Custom proxy headers

To send custom headers to the proxy server (useful for proxy authentication tokens, custom routing, etc.), use the object format:
https://mintcdn.com/bun-1dd33a4e/Hq64iapoQXHbYMEN/icons/typescript.svg?fit=max&auto=format&n=Hq64iapoQXHbYMEN&q=85&s=c6cceedec8f82d2cc803d7c6ec82b240proxy-headers.ts
await fetch("https://example.com", {
  proxy: {
    url: "https://proxy.example.com:8080",
    headers: {
      "Proxy-Authorization": "Bearer my-token",
      "X-Proxy-Region": "us-east-1",
    },
  },
});
The headers property accepts a plain object or a Headers instance. These headers are sent directly to the proxy server in CONNECT requests (for HTTPS targets) or in the proxy request (for HTTP targets). If you provide a Proxy-Authorization header, it will override any credentials specified in the proxy URL.

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Environment variables

You can also set the $HTTP_PROXY or $HTTPS_PROXY environment variable to the proxy URL. This is useful when you want to use the same proxy for all requests.
terminal
HTTPS_PROXY=https://username:[email protected]:8080 bun run index.ts